scholarly journals Modeling Bistable Composite Laminates for Piezoelectric Morphing Structures

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Darryl V. Murray ◽  
Oliver J. Myers
Keyword(s):  
Composite Laminates ◽  
Room Temperature ◽  
Numerical Models ◽  
Fiber Composite ◽  
Temperature Deformation ◽  
Piezoelectric Actuation ◽  
Carbon Fiber Composite ◽  
Unsymmetric Laminates ◽  
Morphing Structure ◽  
Cure Temperature

A sequential modeling effort for bistable composite laminates for piezoelectric morphing structures is presented. Thin unsymmetric carbon fiber composite laminates are examined for use of morphing structures using piezoelectric actuation. When cooling from the elevated cure temperature to room temperature, these unsymmetric composite laminates will deform. These postcure room temperature deformation shapes can be used as morphing structures. Applying a force to these deformed laminates will cause them to snap through to another shape. This bistability arises from the fabrication process of the thin unsymmetric laminates. The snap through force studied here will be controlled by using piezoelectricity. Macrofiber composite (MFC) actuators are used for piezoelectric actuation. In this research, an analytical modeling method is presented to accurately depict the piezoelectric morphing structures. Sequential numerical modeling of the cure process to account for residual stresses and postcured shapes and piezoelectric morphing structure is done to predict the piezoelectric actuated displacements of the thin unsymmetric composite laminates. Analytical and numerical models are compared to experimental methods and results.

Study of Piezoelectric Actuation for Cross-Ply Laminates

2011 ◽  
Author(s):  
Darryl V. Murray ◽  
Oliver J. Myers
Keyword(s):  
Composite Laminates ◽  
Fiber Composite ◽  
Mechanical Strain ◽  
Curing Temperature ◽  
Cylindrical Shape ◽  
Transverse Displacement ◽  
Piezoelectric Actuation ◽  
Carbon Fiber Composite ◽  
Cooling Period ◽  
Measuring Machine

Experimental and numerical methods are presented for piezoelectric actuation of thin deformed post-cure cross-ply carbon fiber composite laminates. During the fabrication process, the composite laminates are held under a press until the curing temperature is reached. After which, the press is released and the laminates are allowed to cool. During this cooling period the once flat composite laminates deform to one of the two cylindrical shapes. The curvature of the cross-ply post-cure cylindrical shape is symmetric and therefore the transverse displacement is measured using a FARO gage coordinate measuring machine (CMM). The snap through force studied here is generated by a macro-fiber composite patch (MFC), which is bonded to the deformed composite plate. Applying a voltage to the MFC patch induces a mechanical strain in the patch which is then transferred from the patch to the composite laminate causing it to snap through to an orthogonal cylindrical shape. After snap through, the second cylindrical shape is measured using the FARO gage CMM. The numerical post fabrication curvatures and piezoelectrically morphed curvatures compare well to the experimental data.

Residual thermal stresses in bismaleimide/carbon fiber composite laminates

1995 ◽  
Vol 16 (4) ◽  
pp. 276-283 ◽  
Author(s):  
Luca Di Landro ◽  
Alberto Palonca ◽  
Giuseppe Sala
Keyword(s):  
Carbon Fiber ◽  
Composite Laminates ◽  
Thermal Stresses ◽  
Fiber Composite ◽  
Carbon Fiber Composite

Numerical and experimental evaluation of mechanical performance of the multifunctional energy storage composites

2021 ◽  
pp. 002199832110495
Author(s):  
Yinan Wang ◽  
Fu-Kuo Chang
Keyword(s):  
Energy Storage ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Fiber Composite ◽  
Mechanical Damage ◽  
Experimental Tests ◽  
Structural Element ◽  
Carbon Fiber Composite

This work presents numerical simulation methods to model the mechanical behavior of the multifunctional energy storage composites (MESCs), which consist of a stack of multiple thin battery layers reinforced with through-the-hole polymer rivets and embedded inside carbon fiber composite laminates. MESC has been demonstrated through earlier experiments on its exceptional behavior as a structural element as well as a battery. However, the inherent complex infrastructure of the MESC design has created significant challenges in simulation and modeling. A novel homogenization technique was adopted to characterize the multi-layer properties of battery material using physics-based constitutive equations combined with nonlinear deformation theories to handle the interface between the battery layers. Second, mechanical damage and failure modes among battery materials, polymer reinforcements, and carbon fiber-polymer interfaces were characterized through appropriate models and experiments. The model of MESCs has been implemented in a commercial finite element code in ABAQUS. A comparison of structural response and failure modes from numerical simulations and experimental tests are presented. The results of the study showed that the predictions of elastic and damage responses of MESCs at various loading conditions agreed well with the experimental data. © 2021

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